The destructive force unleashed when one of a typically passive nature is provoked into violence.

News Anchor: 25 children are dead and 18 are seriously injured after a Mack Attack occured at an elementary school this morning. Causes are still being investigated, but authorities believe the suspected perpetrator became agitated at actions of classmates and unleashed 250,000 megawatts of destructive power.

Jeffery: Yo! You missed it! I was just looking at his notebook when he had a complete Mack Attack! It was crazy! Steve is in the hospital, they say he may never have a face again!

2) Surprise Trolling/Spam, (the coherence of which is often disputed) in a collection of incoherent spams/trolls. Usually involves bringing back something completely worthless or of insignificant value, in a string of worthless attempts at references or personal history, to shame/bring glory to someone/thing.